Facies and climate changes across the Permian–Triassic boundary in the North German Basin: insights from a high-resolution organic carbon isotope record

2013 ◽  
Vol 376 (1) ◽  
pp. 549-574 ◽  
Author(s):  
Michael Hiete ◽  
Heinz-Gerd Röhling ◽  
Carmen Heunisch ◽  
Ulrich Berner
Keyword(s):  
High Resolution ◽  
Organic Carbon ◽  
Climate Changes ◽  
North German Basin ◽  
Triassic Boundary ◽  
The North ◽  
Organic Carbon Isotope ◽  
Isotope Record ◽  
Permian Triassic Boundary ◽  
German Basin

A close-up view of the Permian–Triassic boundary based on expanded organic carbon isotope records from Norway (Trøndelag and Finnmark Platform)

2010 ◽  
Vol 74 (3-4) ◽  
pp. 156-167 ◽  
Author(s):  
Elke Hermann ◽  
Peter A. Hochuli ◽  
Hugo Bucher ◽  
Jorunn O. Vigran ◽  
Helmut Weissert ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Isotope ◽  
Triassic Boundary ◽  
Organic Carbon Isotope ◽  
Permian Triassic Boundary

scholarly journals A Molecular Organic Carbon Isotope Record of Miocene Climate Changes

Science ◽  
1994 ◽  
Vol 263 (5150) ◽  
pp. 1122-1125 ◽  
Author(s):  
M. Schoell ◽  
S. Schouten ◽  
J. S. S. Damste ◽  
J. W. de Leeuw ◽  
R. E. Summons
Keyword(s):  
Organic Carbon ◽  
Carbon Isotope ◽  
Climate Changes ◽  
Organic Carbon Isotope ◽  
Isotope Record

High-resolution organic carbon isotope record across the Cretaceous–Tertiary boundary in south-central Alberta: implications for the post-impact recovery rate of terrestrial ecosystems and use of δ13C as a boundary marker

2007 ◽  
Vol 44 (4) ◽  
pp. 529-542 ◽  
Author(s):  
François Therrien ◽  
David A Eberth ◽  
Dennis R Braman ◽  
Darla K Zelenitsky
Keyword(s):  
High Resolution ◽  
Organic Carbon ◽  
Carbon Isotope ◽  
Terrestrial Ecosystems ◽  
Terrestrial Organic Matter ◽  
Sedimentary Environments ◽  
South Central ◽  
Organic Carbon Isotope ◽  
Isotope Record ◽  
Post Impact

A high-resolution study identified a δ13C excursion of –1.8‰ to –2.3‰ in terrestrial organic matter across the Cretaceous–Tertiary (K–T) boundary at two localities in the Scollard Formation of south-central Alberta, one of the northernmost occurrences of the K–T boundary in terrestrial settings. δ13C values are at their lowest within 6 cm above the K–T boundary claystone and return to pre-boundary levels within 10 cm above the boundary claystone. Statistical analyses reveal that the K–T isotopic shift in Alberta is related to the nature of floral changes that occurred across the K–T boundary. A radiometrically dated bentonite resting on the boundary-hosting Nevis coal at one of the localities permits us to estimate that the terrestrial carbon cycle recovered ~100 000 years after the K–T boundary event, a value that supports an existing hypothesis that terrestrial ecosystems recovered more rapidly than marine ecosystems. The organic carbon isotope record of the entire Scollard Formation demonstrates that the δ13C excursion across the K–T boundary did not reach anomalously low values by late Maastrichtian standards in Alberta. Furthermore, the occurrence of the K–T carbon isotope shift within a restricted stratigraphic interval (<10 cm) greatly limits the probability of its preservation in the context of terrestrial sedimentary environments. These observations suggest that, on their own, δ13C profiles may be unreliable for locating the K–T boundary (and possibly other geologically instantaneous events) and that they should be used in combination with other approaches (e.g., palynology) to identify the K–T boundary in sections lacking the boundary claystone and iridium anomaly.

Seismic tomographic interpretation of Paleozoic sedimentary sequences in the southeastern North Sea

Geophysics ◽  
2005 ◽  
Vol 70 (4) ◽  
pp. R45-R56 ◽  
Author(s):  
Lars Nielsen ◽  
Hans Thybo ◽  
Martin Glendrup
Keyword(s):  
North Sea ◽  
Velocity Structure ◽  
Seismic Velocity ◽  
P Wave ◽  
Wide Angle ◽  
North German Basin ◽  
Sedimentary Sequences ◽  
The North ◽  
Crystalline Crust ◽  
German Basin

Seismic wide-angle data were recorded to more than 300-km offset from powerful airgun sources during the MONA LISA experiments in 1993 and 1995 to determine the seismic-velocity structure of the crust and uppermost mantle along three lines in the southeastern North Sea with a total length of 850 km. We use the first arrivals observed out to an offset of 90 km to obtain high-resolution models of the velocity structure of the sedimentary layers and the upper part of the crystalline crust. Seismic tomographic traveltime inversion reveals 2–8-km-thick Paleozoic sedimentary sequences with P-wave velocities of 4.5–5.2 km/s. These sedimentary rocks are situated below a Mesozoic-Cenozoic sequence with variable thickness: ∼2–3 km on the basement highs, ∼2–4 km in the Horn Graben and the North German Basin, and ∼6–7 km in the Central Graben. The thicknesses of the Paleozoic sedimentary sequences are ∼3–5 km in the Central Graben, more than 4 km in the Horn Graben, up to ∼4 km on the basement highs, and up to 8 km in the North German Basin. The Paleozoic strata are clearly separated from the shallower and younger sequences with velocities of ∼1.8–3.8 km/s and the deeper crystalline crust with velocities of more than 5.8–6.0 km/s in the tomographic P-wave velocity model. Resolution tests show that the existence of the Paleozoic sediments is well constrained by the data. Hence, our wide-angle seismic models document the presence of Paleozoic sediments throughout the southeastern North Sea, both in the graben structures and in deep basins on the basement highs.

scholarly journals Aras Valley (northwest Iran): high-resolution stratigraphy of a continuous central Tethyan Permian–Triassic boundary section

Fossil Record ◽  
2020 ◽  
Vol 23 (1) ◽  
pp. 33-69 ◽  
Author(s):  
Jana Gliwa ◽  
Abbas Ghaderi ◽  
Lucyna Leda ◽  
Martin Schobben ◽  
Sara Tomás ◽  
...  
Keyword(s):  
High Resolution ◽  
Carbon Isotopes ◽  
Environmental Changes ◽  
Triassic Boundary ◽  
Nw Iran ◽  
Environmental Setting ◽  
Before And After ◽  
Permian Extinction ◽  
Permian Mass Extinction ◽  
Permian Triassic Boundary

Abstract. The Permian–Triassic boundary section in the Aras Valley in NW Iran is investigated with respect to carbonate microfacies, biostratigraphy (particularly conodonts, nautiloids, and ammonoids), chemostratigraphy (carbon isotopes), and environmental setting. Correlation of the data allows the establishment of a high-resolution stratigraphy based on conodonts (with four Wuchiapingian, 10 Changhsingian, and three Griesbachian zones), ammonoids (with nine Changhsingian zones), and carbon isotopes; it forms the base for the reconstruction of the environmental changes before and after the end-Permian extinction event at the studied locality. In the Aras Valley section, there is no evidence for the development of anoxic conditions, associated with the end-Permian mass extinction.

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